Transcript for New Warning About the Summer's Hottest Shoe, the Flatform

this morning, summer's hottest trend in footwear, platform shoes. They offer height without the high heels. Why they might feel the most comfortable, they might be the most dangerous. ABC's linsey Davis has the story. Reporter: It's the hot shoe of the summer. Half-platform/half-flat. It's called the flat-form. And Miley Cyrus, willow smith and Kate bosworth has been spotted sporting this latest trend. The problem, some podiatrists say the flat-form is dangerous. So many patients come in complaining of ankle problems, heel pain. Reporter: You might call this foot specialist a heel when it comes to saying anything flattering about the flat-form. He says the elevation combined with the inflexibility, don't allow the foot to move in a natural way. The Normal foot should make contact with the ground, to be able to adapt to the ground or terrain. Reporter: This kind of footwear not only prohibits the foot from absorbing shock in the right way, but can lead to instability. We see a person with an ankle injury, where they will rip or tear a ligament and sometimes fracture a bone. Reporter: And as Carrie so infamously learned in this "Sex and the city" episode, what good is a fashionable shoe if you can barely walk in it? One "Vogue" writer, admitted falling for the trend literally. She ended up tearing a ligament wearing what some describe as serious occupational hazards. Try to keep the bulk of your weight on your heel. But how are you supposed to do that while you're walking? What would you say to a patient that said I'm about to buy a pair? I would say, you're probably a chiropractor's dream. Reporter: A word of warning for the fashion-conscious, to watch their step. For "Good morning America," linsey Davis, ABC news, New York. Good advice. I have done that. Twisted my -- and had an embarrassing fall on the day. Ryan and I will catch you if you fall. Burning up "The heat index."

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